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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a222a1480aa490292ee758d28294c3ef1a1230e49ed98c60735c8ab7a5dce62' 
  AND token = 'RJrMffq+h83KGO2/mjawKsiEDroc6X0yPtjGe2UqZHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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