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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67308f006154b8289cc252145491c7fad6d50cda2e2668dcc3caaa5aa8ccb91b' 
  AND token = '1uQUspOKexlqdpX42XKcMSVsUGYKBvroP+t4FX9MaK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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