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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd8dd453e826870aa5553c896104ce2d423130d1fca55106199b6c89d8bb7de5' 
  AND token = 'Kk0lSDPtqRr44IMeYEDYHEVlK7opRnuiAKm0Gfp9INg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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