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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00d2656a78bbfeccb9eb514043b91f4cad29e2d8edf6b7743357209d24607b61' 
  AND token = 'ldb4m3qwrP2PTb/P2RyhImKlshagR1wIK87cwY1xgzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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