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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79888c4f72aec49fb3e9ebc436c6bc7e84eed3f16335d9d9158c8d4b1d8de6fa' 
  AND token = 'Prqr2nwpQxoP1c+IrokhIHrH/miR4vDo6zXkkwXHjho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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