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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '828f7d72311de18632acaffc2f0a488a2e70a820c4913e4b887d8d79e034f417' 
  AND token = '1/Vi3i9BgpDsPVPRpmlke+XIskJlrxHqqA0V8a2a2OE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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