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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7daf4dabbca6b454e2fc1aed2eb009141cf00b471af12dd006a6e55d8a8ec4b9' 
  AND token = 'iVqwgV1tRz2QnNSTBYUsXRxY48EvzKvGzHPl3e/6t+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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