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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1746e72be7f81563706b897cf59053946387f24ec3b0358f95ce15982a5369e5' 
  AND token = 'c3CfYuhDKfBu7c5sN1MX7xNCgtJHzJtjVXBqKyXY9HE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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