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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24b9e0cb9c9c1df39dea84d6f55e539a541873c96d54218363d232cda8f67f1c' 
  AND token = 'ur3LrfbbtzbqXp5mX9qxsbDyMfqruf19SiDxv4o0vAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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