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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41f24d8159710b3054026b8618074cd06db704c01b19088e97a7f52e5312468d' 
  AND token = 'Pm3sfRr2fcqXtQ7lgazFD+lRKfzISmXvpL5WWkNwCOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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