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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd0292e34e65b3575db7ecba76cad8b85ee9a70f7e798d95da2b2ad8457edce0' 
  AND token = 'UVslFoUdTFU9OtY0b4eUmCFAxjqC8d+zbYiqZXBN3HI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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