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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73332f7e968e64e569cfcc0de03151147389f47fcfc7d14a0d85f1438d713567' 
  AND token = 'lze1KZP6q+o80zQGgAk7fC1dTRroVxc5Mtj2Q83oq48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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