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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bcd1eaebd894c74a7b1f7002ba6d51d18da5ec1bed476c3ec4e115cd8565bfc' 
  AND token = '6sZKafBljxNK8VY6ntA8M2WERBCheUJ+T3zjjG6qkko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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