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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df79e3e0041daa4169f73f999965111a5b0e5e0fcd2f9a054bdddd08f41ce6e2' 
  AND token = 'rPaweDicvK8cTfrfMJVAD8TCUAp/Zp79hXNzCGGY1AU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00079

JSON explain

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