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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd50e66bc6f68969cb813a32a4bb0aafb9c118330b58f2bf179289728bb010b11' 
  AND token = 'qH8veWCEKNVQx9ZwZlvMRZ9GZGHAELUqv7pZg4LNxRI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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