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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd2653c8db7e3a6d5295310b8779252b115569e246d99dbc050177d469cb60b0' 
  AND token = 'nlH/3odkkfObpoA50bSakV3Hd3CJSoFY+6nBctNolNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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