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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7aeca8da7e5af9491ad447a46ce0b4acc08cd26dd2016b6fc0d9f7ea8409265' 
  AND token = 'dL5SNTosQSsIQOXRhDucxtELa9qdti1tbgP6Sw7AtqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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