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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5cb27d2840e59bdbf837fbdecb8dd4253ddeb3b7a7cf08d39aca9083070c093' 
  AND token = 'pxeBV367NXov4YNkiorN3nZ676Agf4SQH58Bh+UYJV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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