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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5cfccb4673c27b971b1863e2c5ab4dcab3cdf4f66544cc093a285bb09796f9a' 
  AND token = '0IiKCYGJE6KExcFN1FBAqRWDrTwEU5tE+x9cBs6pq7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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