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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd57c9f61ff5b920b9f94716f014019052b90c7e0991ca6cbc51aff01fd984c3' 
  AND token = 'Hi2XxGycjteXgoy38xLJ2mJH2CJR3VPLS4XOsnUtcmM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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