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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c67563b98cdf6cef8c79726546c38249c29a3803aefd74b7d9da728150c4e90c' 
  AND token = 'OO6ROPM1kE9Poo0j41sB2cz09776r3UfB9JGzbV2AKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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