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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbae73c197e91bd4e1fe532a491fbd458928857fddee9c2b2b7dcfa8a6b5fb81' 
  AND token = 'F5lce8US82Emxf25JWUiJ+CzZpVXkC8RRxUZ3hdEY5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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