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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66697cf57e8be7e6c40114d8b3f326e6990940dc7c5637ee0b8b74f65c59e058' 
  AND token = 'uaeRcFumtlV5L+/ZqPVe5epZ3IdpK2++p+bCnd7sBs0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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