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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c243435483b99b855d3813a0dbc24e6061966e6457195ef702cfc312e315103' 
  AND token = 'oRmKTGJVHNzuC348YfI0W8iEu5OqMTLNQrnqGKbg9TI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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