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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04247f28be0c4a534b79455c7c37bdebcf8616a7d07576f15dc6c28c36c65379' 
  AND token = 'Q3A/SO8WZLzRCwpXQHmx80ZTkc7zGBS8iQjQXOi1+s8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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