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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d07ab4340ef29c58b11a9631741b1d68e9c8cd2a8081e2a94751c125a419d73' 
  AND token = '9AcA+MNXWT0fqKxPfgC7D65HR9a2hTvc7lzS+W98JPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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