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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2579192f6070c3634f72259f3bd334d4b00e4709c668547dd13f5d940b7b2438' 
  AND token = '2fyXStGSvrZ8nObRj1sf0xZujx7RYWZaC2Zq2uGMGqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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