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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '777eb918b9128d42da2a04070a49d368efdaffab4ec8908d5f719f9c1521fc5d' 
  AND token = '4NXJLg47DSyJG9Du83nm3U8VJc/WmhcOll9XdQ+/TZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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