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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ca673eaa18c28957c3ad30041ee04c7671ec4a9a49ed3c42be36fc0c7ab2aaf' 
  AND token = 'my6+8WKXOLLFZ2DYXfbXKVNHrjW9th4jeENgxk0Kdk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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