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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd374384e89773128c56f1ab8d798e688bf11123d88c96c05411f3f5bfa4c08e' 
  AND token = 'WLUiuBq9AmraL6sGKRMrUwG5ia4sclqsuY2ziY/6foM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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