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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e30cde59ac580d5f87dc07d8eddc8e4d6e7c801798be1757ecd482734f2e7941' 
  AND token = 'rUZ6xJP8LPx4d6gBcrSrSqiau3c3Jd/0Nm2kfDXOxRY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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