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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cee19bedc9e8971c95e2d146b4d700939859bdaf376aa1289345fb02c02ced7e' 
  AND token = 'IcCvlzFZjsmjSu0ZWH/mN0ZA14tPZF7Us6nY7E7EO+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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