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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f94debab94ae60c3ba5c948faeafc88656d50211ccb09d3eb54fce825a66eb2' 
  AND token = 'sP29fu8RIYvqvPkwSpe0voOIdVWXme2IN+C/mr3mn8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00070

JSON explain

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