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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df05c4f94d75f80bc07534ca2499672a44070c6eb400de25240e4d038e938c04' 
  AND token = 'DRP6qnfJ5u7YE6wh1wdvgYKwjx/p95w2Eol1Jiobpo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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