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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5743598934d5f7c7563df5e181ee0893faa5a6f26c52f0d1b2cb9ba9d56ed523' 
  AND token = 'LYUTigkEENMnjCS7Cd1c+SfGGI5JUKOlfdaXmUypBII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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