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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99d7e1fa56bf753692790ebd5d284a9eb30b1908d2ca5416211ce5947530a48f' 
  AND token = 'WRZ/t+xilF/09e0O5LGvigqyes7Eqv39irEXr96Aidc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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