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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '028a4c44dc4f629b4f6ed2758519b57283dcae7dd7ba85f636c2845f5f3ac825' 
  AND token = 'EY7DHgzoIX27XTZR38imEHtXNnUpzOf76I1TCkoc4Ys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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