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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18cdb89612a95f2aa44d7403bef38ce06cac09adb555c5ee05931274f7af8200' 
  AND token = 'lBFrK4MC5GFyFpx4lXqxLdd5LgINiTMJB8tGhrnMK0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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