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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '590ebbfbd27d36b4784753e38956f1e467138381e1720cb0721d90be60295cda' 
  AND token = 'Hup2D4HcP5/WDkVp5eU7CRJFXePgWPoQJau974wuo+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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