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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44fbd6f689d9153e791e1752904ebdd04150f8aabfbbfa979e0ffa36c3322201' 
  AND token = 'B+QJbLiJvci76KGGZdNo+1Oxdpz1p6EcJwnMS711+S8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}