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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c2e92d056a238f156d1aa5fe1c283448608b141dc264f320c29c40eef5e9c6e' 
  AND token = '3SrHo7mOtvwuNy4yMI5mEixqDIKAdVn2LQpjR73vDuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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