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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19d7792e1f4791bbd2546d560b3b493b9ef970b620de7f5b939df56933d8801f' 
  AND token = 'iHcm3rldcPmIVvucQMrWrBC/ICFjlyQJy/DI4NSUHBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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