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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b7d4154d5d7463b95d32014517f00c3c7893b0ad2df73b7d11a83715a6f06a7' 
  AND token = 'RF72hVAsYqHWsJRaB03o68ZDl5QmTiPyNvqnChCsiso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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