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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db991f03cb761a9f103f36888f8372ea5b28f806fe03984270633e96b1608015' 
  AND token = 'UP6r+qbfONzvl9a3mXAss1anDeropY4hNByU90yrrZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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