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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd92b8162b318ba10f65bb64232b19f5e33dff561ea12a3815e98698c57190e6d' 
  AND token = 'iWF+5ny2I5ZJexZA1V4iInQAg2EpGJTQL/PgHgcvO7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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