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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d6c79eb55692102f42ec8d5ff864f8d3bd7645217db0613dc0cb56b3925e801' 
  AND token = 'aSZIwQ8dDu/R4AFcOGAUMPkWkaT3XpTErquWBl15Wyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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