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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '241365dce950908afd7a5521919918f40dd1b19986f3d9eb03c44abf08031d95' 
  AND token = 'ts2eod2a60m6u7A5bqtnmiNmHtmApvrIxfdHPW4byHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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