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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'daa9ffb9ac25726ccc8510acc0fdbd6274e0be65c4347ee34cfcf2b777dba4d6' 
  AND token = 'mWqGtlmkfHHo37c89NufICvqxnpN/rPVllDfTG6+cMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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