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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5750da7114c65a433fcaa61dd1d4271b6cdeba615b5b79359bdf99454b12e714' 
  AND token = '3F6niW7R5ng46guFBp9tO7Gg98H5Phd/JK3L2K61glg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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