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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c311c010f3830fbdb5e41113108402427960fc2d594a3310ca5d6c60f73fda73' 
  AND token = 'hGTqKalALSS1c6U3WbMKAyAy3rVBoOzHdu+30rSriss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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