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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df0c8e9ebf0b616baa9c2d32168e7c506ef9fafa99868c88eb66fffa5dc55721' 
  AND token = 'X5a4/Q9glauWt8Ixw6F8bSHRjnNtG3TVqhyAttmxHTk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00071

JSON explain

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