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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0686ee002108557dd655e41d1cea17f46b3dbcf328f46d01d52baf80b8954a8d' 
  AND token = 'yMDAiTqWy4RNth/mJl7XqheSNesWmPF257mo11viOSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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