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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6f502be7a96329d277963a475ecaa5d651dcaeaaea66fbb6ebf0569a95a0b02' 
  AND token = 'xjRxdYLdt09L2V1U+rn0HG0yGiKXqpjAzeZQhA51Gag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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