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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bae7ccdfb732bc625f6166440849479dd7c1c26d0e9e53ebc35f2a6a90d9795c' 
  AND token = 'v9KUMhlb+0UrHT+1C5UFmMqnI8WaT33NocRZrCk/+Y0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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